Solid state relay

Abstract

A solid state relay is disclosed. The solid state relay includes an N-type MOSFET transistor, the drain of the N-type MOSFET transistor is connected with the positive electrode of the automobile battery, the source of the N-type MOSFET transistor is connected to the load input terminal, the gate of the N-type MOSFET transistor is connected to a booster circuit, the drain of the N-type MOSFET transistor is also connected with a voltage drop acquisition circuit of the N-type MOSFET transistor. The solid state relay also includes a switching logic control circuit, the input terminal A and the input terminal B of the solid-state relay are connected with a switch logic control circuit, the function of the switching logic control circuit is to convert a positive or negative control level of an external input connecting the input terminal A and the input terminal B to the solid-state relay to a control level of the N-type MOSFET transistor, one output terminal of the switching logic control circuit is connected with the booster circuit, and the other output terminal of the switching logic control circuit is connected with an N-type MOSFET transistor voltage drop acquisition circuit.

Description

technical field [0001] The invention belongs to the technical field of auto parts, in particular to a high-current solid-state relay for vehicles. Background technique [0002] With the development of new energy and electric vehicles, some high-power loads such as compressors, vacuum pumps, etc., which were directly driven by gasoline engines, can no longer be directly driven by engines. At the same time, the electrical life of traditional electromagnetic relays that control these load switching cannot exceed the life cycle of the vehicle, and will cause safety risks after reaching the life cycle. Therefore, the development of new energy vehicles has created a demand for high-current solid-state relays. [0003] The existing automotive solid-state relays mainly use smart high-side MOSFETs from manufacturers such as Infineon and ST. The advantages of these devices are comprehensive functions and simple usage, but they are expensive. And because the internal resistance of th...

AI Technical Summary

Problems solved by technology

[0005] The invention provides a solid-state relay, which can be used for the electrical control of electric vehicles, and also solves the problem that the MOSFET tubes used in the existing vehicle solid-state relays generate large heat and high cost, and are difficult to directly replace in the existing vehicle electrical control Traditional Electromagnetic Relay

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